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September weather forecast in Derry

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	752 mmHg		81%
	6.2 m/s		+16

31 August, Sunday. day, 16°; night, 11°; overcast

1 September, mon

	752 mmHg		82%
	6.6 m/s		+16

1 September, Monday. day, 17°; night, 12°; rain

2 September, tue

	751 mmHg		83%
	6.2 m/s		+16

2 September, Tuesday. day, 17°; night, 12°; overcast

3 September, wed

	750 mmHg		83%
	6.5 m/s		+16

3 September, Wednesday. day, 17°; night, 12°; overcast

4 September, thu

	751 mmHg		84%
	6.7 m/s		+15

4 September, Thursday. day, 17°; night, 12°; rain

5 September, fri

	751 mmHg		83%
	7 m/s		+15

5 September, Friday. day, 16°; night, 12°; rain

6 September, sat

	750 mmHg		83%
	7.4 m/s		+14

6 September, Saturday. day, 16°; night, 12°; rain

7 September, sun

	749 mmHg		84%
	7.1 m/s		+16

7 September, Sunday. day, 16°; night, 12°; partly cloudy

8 September, mon

	749 mmHg		82%
	6.7 m/s		+16

8 September, Monday. day, 16°; night, 12°; partly cloudy

9 September, tue

	750 mmHg		82%
	7.2 m/s		+16

9 September, Tuesday. day, 16°; night, 12°; rain

10 September, wed

	749 mmHg		82%
	6.9 m/s		+15

10 September, Wednesday. day, 16°; night, 11°; rain

11 September, thu

	748 mmHg		84%
	7.7 m/s		+15

11 September, Thursday. day, 15°; night, 11°; rain

12 September, fri

	749 mmHg		82%
	7.4 m/s		+15

12 September, Friday. day, 15°; night, 11°; rain

13 September, sat

	750 mmHg		81%
	7.8 m/s		+14

13 September, Saturday. day, 16°; night, 11°; rain

14 September, sun

	751 mmHg		82%
	7.3 m/s		+14

14 September, Sunday. day, 15°; night, 11°; rain

15 September, mon

	751 mmHg		82%
	7.2 m/s		+14

15 September, Monday. day, 15°; night, 11°; overcast

16 September, tue

	751 mmHg		81%
	7.1 m/s		+14

16 September, Tuesday. day, 15°; night, 11°; rain

17 September, wed

	750 mmHg		81%
	6.4 m/s		+14

17 September, Wednesday. day, 15°; night, 10°; partly cloudy

18 September, thu

	750 mmHg		81%
	6.7 m/s		+14

18 September, Thursday. day, 15°; night, 10°; partly cloudy

19 September, fri

	750 mmHg		82%
	6.8 m/s		+14

19 September, Friday. day, 15°; night, 10°; partly cloudy

20 September, sat

	750 mmHg		82%
	7.1 m/s		+15

20 September, Saturday. day, 16°; night, 11°; clear

21 September, sun

	749 mmHg		82%
	7.2 m/s		+15

21 September, Sunday. day, 15°; night, 11°; partly cloudy

22 September, mon

	750 mmHg		81%
	7.3 m/s		+14

22 September, Monday. day, 15°; night, 10°; clear

23 September, tue

	749 mmHg		81%
	7.6 m/s		+14

23 September, Tuesday. day, 15°; night, 10°; rain

24 September, wed

	748 mmHg		82%
	7.4 m/s		+14

24 September, Wednesday. day, 14°; night, 10°; partly cloudy

25 September, thu

	749 mmHg		83%
	7.5 m/s		+14

25 September, Thursday. day, 15°; night, 10°; rain

26 September, fri

	749 mmHg		81%
	7.6 m/s		+15

26 September, Friday. day, 15°; night, 10°; overcast

27 September, sat

	749 mmHg		82%
	7.5 m/s		+15

27 September, Saturday. day, 14°; night, 10°; rain

28 September, sun

	748 mmHg		81%
	7.6 m/s		+15

28 September, Sunday. day, 15°; night, 10°; rain

29 September, mon

	747 mmHg		81%
	7.2 m/s		+14

29 September, Monday. day, 15°; night, 10°; rain

30 September, tue

	746 mmHg		85%
	7.8 m/s		+14

30 September, Tuesday. day, 14°; night, 10°; rain

1 October, wed

	745 mmHg		82%
	8.1 m/s		+14

1 October, Wednesday. day, 14°; night, 10°; clear

2 October, thu

	747 mmHg		81%
	8.1 m/s		+13

2 October, Thursday. day, 14°; night, 10°; overcast

3 October, fri

	746 mmHg		81%
	8.8 m/s		+13

3 October, Friday. day, 13°; night, 10°; rain

4 October, sat

	746 mmHg		82%
	8.6 m/s		+13

4 October, Saturday. day, 13°; night, 10°; rain

Average data for 10 years

Derry September

2

sunny days

17

days with precipitation

14

cloudy days

2 sunny days; 17 days with precipitation; 14 cloudy days;

82

%

air humidity

5.3

m/s

WindSW

85

mm of precipitation

(8% of annual average)

+15

°C

Water temperature

air humidity 82%; 85 millimeters of precipitation (8% of annual average); Wind south-westerly 5.3 Meters per second; Water temperature +15°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

SW

SW

SW

SW

S

SW

S

S

S

S

S

S

S

S

S

SW

SW

S

S

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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28

29

30

Daytime temperature

Night-time temperature

Cities near you

Dublin
Carrickfinn
Glasgow
Cork
Galway
Wicklow
Belfast
Oban
Ballyvaughan

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Cholpon-Ata
Oslo
Yurmala
Palanga
Buenos Aires

The weather forecast for September 2025 is based on historical data from the past 10 years.

In September, the weather in Derry is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Derry has 17 rainy, 7 partly cloudy, 4 cloudy, and 2 sunny days in September. The rains are usually moderate. September as well as January, February, March, and April is considered the most uncomfortable time to visit Derry.

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